Long-Time Disconnect Delayer Circuit

Published:2011/4/22 4:26:00 Author:Christina | Keyword: Long-Time Disconnect, Delayer Circuit | From:SeekIC

If we combine the timer 555, optical isolator 1300 and the bridge trigger triac switch, and press the control switch to supply power to the AC motor or other devices for 1h, timer(2)'s voltage will be less than 1/3Vcc, the timer output power become high, so the LED turn-on. At the same time, the capacitor of (7) starts charging, and before the voltage is 2/3VCC, output power is still high; when the output power back to low, turn off the motor.



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